Refrigerating machine oil composition

Abstract

A refrigerating machine oil composition comprising an alicylic dicarboxylic acid ester compound having an alicyclic ring and two ester groups represented by formula (1) bonded to adjacent carbon atoms of the alicyclic ring:wherein R1 represents an alkyl group having 1-18 carbon atoms, said alicyclic dicarboxylic acid ester compound being obtained by using an alcohol component comprising (a) at least one alcohol selected from a group consisting of fatty alcohols each having 1 to 5 carbon atoms; and (b) at least one alcohol selected from a group consisting of fatty alcohols each having 6 to 18 carbon atoms.

What is claimed is:  
     
       1. A refrigerating machine oil composition comprising a refrigerant selected from the group consisting of hydrofluorocarbon refrigerants, fluorine-containing ether refrigerants, fluorine-free ether refrigerants, natural refrigerants and mixtures thereof and an alicylclic dicarboxylic acid ester compound having an alicylclic ring and two ester groups represented by formula (1) bonded to adjacent carbon atoms of the alicyclic ring: 
       
         
           —COOR 1   (1)  
         
       
       wherein R 1  represents an alkyl group having 1-18 carbon atoms, said alicyclic dicarboxylic acid ester compound being obtained by using an alcohol component comprising: 
       (a) at least one alcohol selected from a group consisting of fatty alcohols each having 1 to 5 carbon atoms; and  
       (b) at least one alcohol selected from a group consisting of fatty  
       wherein the mole ratio between said fatty alcohol (a) and fatty alcohol (b) employed as said alcohol component ranges from 1:99 to 99:1.  
     
     
       2. A refrigerating machine oil composition according to  claim 1 , wherein said fatty alcohol (a) is at least an alcohol selected from a group consisting of n-butanolandn-pentanol. 
     
     
       3. A refrigerating machine oil composition according to  claim 1 , wherein said fatty alcohol (a) is at least an alcohol selected from a group consisting of iso-butanol and iso-pentanol. 
     
     
       4. A refrigerating machine oil composition according to  claim 1 , wherein said fatty alcohol (b) is at least an alcohol selected from a group consisting of fatty alcohols each having 6 to 12 carbon atoms. 
     
     
       5. A refrigerating machine oil composition according to  claim 1 , wherein said fatty alcohol (b) is at least an alcohol selected from a group consisting of fatty alcohols each having 7 to 9 carbon atoms. 
     
     
       6. A refrigerating machine oil composition according to  claim 1 , further comprising an epoxy compound. 
     
     
       7. A refrigerating machine oil composition according to  claim 6 , wherein said epoxy compound is at least one compound selected from a group consisting of phenylglycidyl ether epoxy compounds, glycidyl ester epoxy compounds, alicyclic epoxy compounds and epoxidized aliphatic acid monoesters. 
     
     
       8. A refrigerating machine oil composition according to  claim 6 , wherein said epoxy compound is at least one compound selected from a group consisting of glycidyl ester epoxy compounds and alicyclic epoxy compounds. 
     
     
       9. A refrigerating machine oil composition according to  claim 7 , further comprising a phosphorus compound. 
     
     
       10. A fluid composition for refrigerating machines comprising the refrigerating machine oil composition according to  claim 1  and a chlorine-free fluorocarbon. 
     
     
       11. A refrigerating machine oil composition according to  claim 1 , wherein said alicyclic dicarboxylic acid ester compound is an alicyclic diarboxylic acid ester having two ester groups represented by formula (1), wherein one ester group is derived from the fatty alcohol (a) and the other ester group is derived from the fatty alcohol (b). 
     
     
       12. A refrigerating machine oil composition according to  claim 1 , wherein said alicyclic dicarboxylic acid ester compound is a mixture of an alicyclic dicarboxylic acid ester having two ester groups represented by formula (1) which are derived from said fatty alcohol (a) and an alicyclic dicarboxylic acid ester having two ester groups represented by formula (1) which are derived from said fatty alcohol (b). 
     
     
       13. A refrigerating machine oil composition according to  claim 1 , wherein said alicyclic dicarboxylic acid ester compound is a mixture of: 
       (a) an alicyclic dicarboxylic acid ester having two ester groups represented by formula (1), wherein one ester group is derived from said fatty alcohol (a) and the other ester group is derived from said fatty alcohol (b); and  
       (b) a mixture of an alicyclic dicarboxylic acid ester having two ester groups represented by formula (1) which are derived from said fatty alcohol (a) and an alicyclic dicarboxylic acid ester having two ester groups represented by formula (1) which are derived from said fatty alcohol (b).